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지능형 주거 공간을 위한 24시간 연속적인 건강 모니터링 시스템 구현
오승환,이희영 전남대학교 전자통신기술연구소 2001 전자통신기술논문지 Vol.4 No.1
This paper presents a wireless potable telemetry healthcare monitoring system with the characteristics of small size (42mmx75mmx15mm) and low power consumption (90mw) for the elderly and the disabled. The healthcare system consists of a measurement device, a diagnosis S/W and a user interface S/W. The measurement device is designed according to the international specifications of the recommendation of AAMI (Association for the Advancement of Medical Instrumentation). The measurement device has the functions that adjust gain and cut-off frequency to acquire various bio-signals such as ECG, EMG and EEG. It has wireless communication using Bluetooth to send a data between a host computer and other device.
오승환,임현민,이동희,서동혁,김원진,김륜나,김우병,Oh, Seung-Hwan,Yim, Hyeonmin,Lee, Donghee,Seo, Dong Hyeok,Kim, Won Jin,Kim, Ryun Na,Kim, Woo-Byoung 한국재료학회 2022 한국재료학회지 Vol.32 No.9
In this study, surface roughness and interfacial defect characteristics were analyzed after forming a high-k oxide film on the surface of a prime wafer and a test wafer, to study the possibility of improving the quality of the test wafer. As a result of checking the roughness, the deviation in the test after raising the oxide film was 0.1 nm, which was twice as large as that of the Prime. As a result of current-voltage analysis, Prime after PMA was 1.07 × 10 A/cm<sup>2</sup> and Test was 5.61 × 10 A/cm<sup>2</sup>, which was about 5 times lower than Prime. As a result of analyzing the defects inside the oxide film using the capacitance-voltage characteristic, before PMA Prime showed a higher electrical defect of 0.85 × 10<sup>12</sup> cm<sup>-2</sup> in slow state density and 0.41 × 10<sup>13</sup> cm<sup>-2</sup> in fixed oxide charge. However, after PMA, it was confirmed that Prime had a lower defect of 4.79 × 10<sup>11</sup> cm<sup>-2</sup> in slow state density and 1.33 × 10<sup>12</sup> cm<sup>-2</sup> in fixed oxide charge. The above results confirm the difference in surface roughness and defects between the Test and Prime wafer.
졸-겔법에 의한 Cugkadb 인산염계 수용성 유리의 제조 및 특성
오승환,최세영,김경남 한국세라믹학회 1998 한국세라믹학회지 Vol.35 No.4
Sol-gel derived phosphate water-sioluble glasses containing Cu were prepared. Powder-shape of glasses were added in D.I water used polyethylene bottle. After solution contained glass powder were submerged in water bath on 25$^{\circ}C$ their dissolution behavior/characteristics bactericidal effect and cytotoxicity test were evaluated. The maximum amount of Cu(35 mol%) via sol-gel method was more 5 mol% increased than that with melting process. The stage of total dissolution was more dominant than that of selective leaching dur-ing dissolution due to dissolved amount of glasses increased linearly with time. The ratio of Cu+ to {{{{ {Cu }^{2+ } }} was 3:7 so that the structure of glasses is more predominant 2-dimension chain structure than 3-dimenshion po-lymeric structue. The stage of total dissolution was more dominant than that of selective leaching during dissolution. Bactericidal effect against all bacteria showed that solutions which contained 40 ppm and 100 ppm of Cu killed 80 percentages of bacteria within 2 hours and 100 percentages of those within 12 hours. The results of cytotoxicity test for L929 cells showed no cytotoxicity were observed within 96 hours for dis-solved solution that contains 40 ppm and 100 ppm of Cu.